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The sparky disconnected each neutral in the CU in turn, but the RCD tripped every time. It proved to be a live-earth fault, somewhere on the supply to an outbuilding/workshop. Circuit now disconnected, to be rewired in due course. Thank again for the helpful replies.

Many thanks for the three replies - they've helped my understanding considerably. I've now briefed a sparky from an informed position, and he's now sorted it. This is a very valuable forum, not just for professionals but also for those who know their limitations, but wish to engage in an...

Returned home late last night to a tripped RCD (Steeple 80A 30mA). Switched off all MCBs on the relevant busbar - still tripped. Even removed the busbar altogether - still tripped. Any advice gratefully received folks. Thanks.

Sorry, old bean. One didn't mean to sound up oneself. My wife is Italian (true) and one therefore acquires some informal habits of language. Hadn't appreciated that this forum also helps to shape one's vocabulary so that contributors like "moi" (?French) can sand lyke a right proper geezer, innit.

Okay guys - fair enough: you've made your point loud and clear! I hear and will follow your very sound advice. I'll stick to just chasing the walls, fitting back boxes and drilling the holes in joists (and yes, I've checked the building regs, and know where I can and where I can't drill, at what...

Grateful thanks to ColJack and ban-all-sheds for your replies. Much appreciated. The electrican is away on holiday for two weeks, and I was hoping to complete the first and second fix ahead of his coming in to do the 'qualified bit' at the CU - connection and testing. I'm inclined to create a...

I'm assisting a qualified electrician to do a complete house re-wire, by pre-lifting floorboards, chasing walls, etc. (all the grunt work!). I'd like to re-locate the CU, which is low down and difficult to get to under the stair cupboard. The house is an ex-council property, built about 1960...